31123452 has 12 divisors (see below), whose sum is σ = 72621416. Its totient is φ = 10374480.

The previous prime is 31123451. The next prime is 31123457. The reversal of 31123452 is 25432113.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1296799 + ... + 1296822.

Almost surely, 2^31123452 is an apocalyptic number.

It is an amenable number.

31123452 is an abundant number, since it is smaller than the sum of its proper divisors (41497964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31123452 is a wasteful number, since it uses less digits than its factorization.

31123452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593628 (or 2593626 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 31123452 is about 5578.8396643030. The cubic root of 31123452 is about 314.5545126217.

Adding to 31123452 its reverse (25432113), we get a palindrome (56555565).

The spelling of 31123452 in words is "thirty-one million, one hundred twenty-three thousand, four hundred fifty-two".